CN101832993B - Semi-module test box for dynamic compaction reinforced foundation model test - Google Patents

Semi-module test box for dynamic compaction reinforced foundation model test Download PDF

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Publication number
CN101832993B
CN101832993B CN 201010179323 CN201010179323A CN101832993B CN 101832993 B CN101832993 B CN 101832993B CN 201010179323 CN201010179323 CN 201010179323 CN 201010179323 A CN201010179323 A CN 201010179323A CN 101832993 B CN101832993 B CN 101832993B
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model
hammer
angle steel
box
model casing
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CN101832993A (en
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冯世进
胡斌
熊巨华
高丽亚
李夕林
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Tongji University
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Tongji University
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Abstract

The invention belongs to the technical field of rock-soil engineering, and in particular relates to a semi-module test box for dynamic compaction reinforced foundation model test. The semi-module test box consists of a chute, a fixed cross beam, a bracket, a guide rod, a semicircular model hammer, a limit rod, a fixed corner bracket, a model box, a soil pressure box and an acceleration sensor. The fixed cross beam is welded with a cross rod; and a vertical rod in the bracket is connected with an angle steel above the model box. The chute is fixed on the cross beam; a sliding bolt is embedded into the chute, the upper end of the guide rod is connected with the sliding bolt, and the lower end of the guide rod is suspended; and the guide rod passes through a central hole of the semicircular model hammer, the limit rod is positioned above the model box, the upper end of the limit rod is welded with the cross rod in the bracket, and the lower end of the limit rod is welded with the angle steel on the model box. The model box consists of the angle steel, an organic glass board, side panels, a back board and a bottom board; the soil pressure box is embedded in a soil sample; and the acceleration sensor is placed on the top of the soil sample. The semi-module test box ensures that the internal deformation of the soil under the action of dynamic compaction can be directly and conveniently observed, and can measure related data of dynamic stress and the like.

Description

Semi-module test box for dynamic compaction reinforced foundation model test
Technical field
The invention belongs to the Geotechnical Engineering field, be specifically related to a kind of semi-module test box for dynamic compaction reinforced foundation model test.
Background technology
Heavy-tamping method is French Mei Na (Menard) the technology company a kind of foundation reinforcement method pioneering in 1969, ram the soil body by hammer ram, make the soil body become more closely knit, soil strength and load-bearing capacity obtain larger raising, heavy-tamping method at home and abroad is widely applied in foundation treatment engineering in recent years, has become one of main method of large tracts of land ground processing.But, at present for the reinforcement mechanism of heavy-tamping method, and various ram parameter on the forced ramming reinforcing effect to affect rule research also less.Although the heavy-tamping method development is very fast, the design of heavy-tamping method and construction also are in half theoretical semiempirical state, and the site operation parameter still needs to determine by a large amount of site tests, lacks necessary theoretical foundation, has larger blindness and uncertainty.Can further investigate the reinforcement mechanism of heavy-tamping method by indoor model test, and the Optimization Design of proposition strong rammer, but owing to lacking rational strong rammer indoor model test device, make the indoor model test of heavy-tamping method be difficult to carry out, restricted heavy-tamping method further develop and perfect.
Summary of the invention
The object of the present invention is to provide a kind of semi-module test box for dynamic compaction reinforced foundation model test.
The semi-module test box for dynamic compaction reinforced foundation model test that the present invention proposes, by set bolt 1, sliding tray 2, fixed cross beam 3, support 4, slide bolt 5, guide pole 6, semicircle model hammer 7, gag lever post 8, fixedly corner bracket 9, model casing 10, soil pressure cell 11 and acceleration transducer 12 form, its structure such as Fig. 1, Fig. 2 and shown in Figure 3.Wherein, set bolt 1, sliding tray 2, fixed cross beam 3, support 4, slide bolt 5, guide pole 6, semicircle model hammer 7, gag lever post 8, fixedly corner bracket 9 forms loading systems.Support 4 is the framed structures that are welded by montant 13 and cross bar 14, and fixed cross beam 3 is fixed in cross bar 14 tops; Montant 13 in support 4 is positioned at model casing 10 tops, is connected with the angle steel 15 that is positioned at model casing 10 tops by bolt, and is welded and fixed by fixing corner bracket 9; Sliding tray 2 is fixed on crossbeam 3 by set bolt 1; Slide bolt 5 embeds in sliding tray 2, and slide bolt 5 can slide along sliding tray 2, and the semicircle model hammer 7 that different-diameter can conveniently be installed can rise to different starting altitudes with semicircle model hammer 7; Guide pole 6 upper ends are connected with slide bolt 5, the unsettled placement in lower end; Guide pole 6 passes the center pit of semicircle model hammer 7, waving in restriction semicircle model hammer 7 dropping process, and guide pole 6 diameters can be adjusted according to the center-hole diameter of semicircle model hammer 7.Gag lever post 8 is positioned at the top of model casing 10, cross bar 14 welding in gag lever post 8 upper ends and support 4, angle steel 15 welding on lower end and model casing 10; Model casing 10 is comprised of angle steel 15, poly (methyl methacrylate) plate 16, side panel 17, backplate 18 and base plate 19, and poly (methyl methacrylate) plate 16, two side panels 17, backplate 18 and base plates 19 connect to form the model casing framework, and the surrounding of model casing framework embeds in angle steel 15; Soil pressure cell 11 is embedded in soil sample 21, and the quantity of soil pressure cell 11 is determined on a case-by-case basis; Acceleration transducer 12 is positioned over soil sample 21 tops.
In the present invention, the montant 13 in support 4 and cross bar 14 are respectively 4, form a framed structure, are placed on model casing 10 tops.
In the present invention, totally 12, the angle steel 15 in model casing 10 lays respectively at model casing frame roof, bottom and centre, is respectively 4.
In the present invention, semicircle model hammer 7 is along guide pole 6 free-fallings, and guaranteed the vertical whereabouts of semicircle model hammer 7 by gag lever post 8, avoids colliding poly (methyl methacrylate) plate 16.
In the present invention, the front of model casing 10 is poly (methyl methacrylate) plates 16, and the above portrays scale mark 20, can directly observe the internal modification of soil sample 21, and the sparse degree of scale mark can be formulated according to concrete test.
In the present invention, slide bolt 5 embeds in sliding tray 2, in order to adapt to the semicircle model hammer 7 of different-diameter.
The course of work of the present invention is as follows:
The soil sample 21 of packing in model casing 10, according to the actual tests needs, layering landfill soil sample 21, and the soil sample that is provided with color between the landfill soil layer line that serves as a mark.Bury the soil pressure cell 11 of some quantity in sample underground, acceleration transducer 12 is placed in sample top installation.Soil pressure cell 11 is connected with acceleration transducer and is connected with the external data acquisition system by wire, image data.Guide pole 6 is penetrated in semicircle model hammer 7, and semicircle model hammer 7 is promoted to the test desired height along guide pole 6, then allows 7 free-fallings of semicircle model hammer ram the soil body, and can repeatedly ram.In whole process of the test, the stress of soil sample 21 inside can be by soil pressure cell 11 tests; The internal modification of soil sample 21 can directly read by the poly (methyl methacrylate) plate 16 of portraying scale mark 20.Obtain the stressed and distortion of soil sample 21 inside under the strong rammer effect, just can analyze the reinforcement mechanism of heavy-tamping method, study the various parameters of ramming to the rule that affects of forced ramming reinforcing effect, propose the Optimization Design of forced ramming reinforcing.
Beneficial effect of the present invention:
But the great advantage of apparatus of the present invention is soil body internal deformations under the observation strong rammer effect of direct convenience, and can record the related data such as dynamic stress, has solved the more deficiency that existing heavy-tamping method indoor model test device exists.
Description of drawings
Fig. 1 is front view of the present invention.
Fig. 2 is vertical view of the present invention.
Fig. 3 is side view of the present invention.
Number in the figure: 1 is set bolt, and 2 is sliding tray, and 3 is fixed cross beam, and 4 is support, 5 is slide bolt, and 6 is guide pole, and 7 is the semicircle model hammer, and 8 is gag lever post, 9 are fixing corner bracket, and 10 is model casing, and 11 is soil pressure cell, and 12 is acceleration transducer, 13 is montant, and 14 is cross bar, and 15 is angle steel, 16 is poly (methyl methacrylate) plate, and 17 is side panel, and 18 is backplate, 19 is base plate, and 20 is scale mark, and 21 is soil sample.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1, and in model casing 10, the length of angle steel 15 is 1000 millimeters, and width is 25 millimeters, and thickness is 4 millimeters.The side panel 17 of model casing 10, backplate 18 and base plate 19 are the plank of 30 millimeters of thickness, the front of model casing 10 is the poly (methyl methacrylate) plate 16 of 10 millimeters of thickness, the length of each piece panel, base plate and width are 1000 millimeters, the surrounding of model casing framework embeds in angle steel 15, and is connected with angle steel 15 by bolt.Portray scale mark 20 on poly (methyl methacrylate) plate 16, each grid of scale mark is of a size of 10 millimeters * 10 millimeters.Support 4 is welded by 4 montants 13 and 4 cross bars 14, and montant 13 and cross bar 14 are all 1000 millimeters of length, 20 millimeters of external diameters, the steel pipe that wall thickness is 2 millimeters.4 montants 13 in support 4 are positioned at the top of model casing 10, are connected with the angle steel 15 that is positioned at model casing 10 tops by bolt, and are welded and fixed by fixing corner bracket 9, and fixedly corner bracket 9 is 300 millimeters of length, 20 millimeters of width, the steel bar that thickness is 5 millimeters.The two ends of fixed cross beam 3 are welded on the middle part of cross bar 14 in support 4.Fixed cross beam 3 is 10 millimeters of thickness, 20 millimeters of width, and length is the steel of 1000 millimeters.Sliding tray 2 thickness are 20 millimeters, and width is 30 millimeters, and length is 1000 millimeters; In sliding tray 2 inside, digging along its length a width is 20 millimeters, and the degree of depth is the groove of 5 millimeters, and whole sliding tray 2 xsects are concave character type; In the concave character type opening part reduced width of sliding tray 2, the top of slide bolt 5 can embed in sliding tray 2, and can slide and fix along sliding tray 2.Cross bar 14 welding in gag lever post 8 upper ends and support 4, angle steel 15 welding on lower end and model casing 10,4 gag lever posts 8 are all that 5 millimeters of diameters, length are the smooth steel pole of 1000 millimeters.Guide pole 6 is smooth steel pole, and diameter is 6 millimeters, and length is 950 millimeters, the top of guide pole 6 and slide bolt 5 welding, and the bottom is free end.Semicircle model hammer 7 is half-cylindrical, and diameter is 30 millimeters of 120 millimeters, thickness, and it is the hole of 6 millimeters that the centre of gravity place of semicircle model hammer 7 is drilled with diameter, so that the penetrating of guide pole 6.Control the spacing of guide pole 6 and gag lever post 8 by mobile slide bolt 5, make the side of semicircle model hammer 7 and gag lever post 8 tangent.Fill soil sample 21 in model casing, at inner embedding 13 soil pressure cells 11 of soil sample 21, and at 3 acceleration transducers 12 of soil sample 21 tops placements.With reference to Fig. 1～Fig. 3, those skilled in the art all can implement smoothly.

Claims (3)

1. semi-module test box for dynamic compaction reinforced foundation model test, by set bolt (1), sliding tray (2), fixed cross beam (3), support (4), slide bolt (5), guide pole (6), semicircle model hammer (7), gag lever post (8), fixing corner bracket (9), model casing (10), soil pressure cell (11) and acceleration transducer (12) form, it is characterized in that set bolt (1), sliding tray (2), fixed cross beam (3), support (4), slide bolt (5), guide pole (6), semicircle model hammer (7), gag lever post (8) and fixedly corner bracket (9) form loading system, support (4) is the framed structure that is welded by montant (13) and cross bar (14), fixed cross beam (3) is fixed in above cross bar (14), montant (13) in support (4) is positioned at model casing (10) top, is connected with angle steel (15) above being positioned at model casing (10) by bolt, and is welded and fixed by fixing corner bracket (9), sliding tray (2) is fixed on crossbeam (3) by set bolt (1), slide bolt (5) embeds in sliding tray (2), slide bolt (5) can slide along sliding tray (2), the semicircle model hammer (7) of different-diameter can conveniently be installed, semicircle model hammer (7) can be risen to different starting altitudes, guide pole (6) upper end is connected with slide bolt (5), the unsettled placement in lower end, guide pole (6) passes the center pit of semicircle model hammer (7), waving in restriction semicircle model hammer (7) dropping process, and guide pole (6) diameter can be adjusted according to the center-hole diameter of semicircle model hammer (7), gag lever post (8) is positioned at the top of model casing (10), cross bar (14) welding in gag lever post (8) upper end and support (4), angle steel (15) welding on lower end and model casing (10), model casing (10) is comprised of angle steel (15), positive poly (methyl methacrylate) plate (16), side panel (17), backplate (18) and base plate (19), poly (methyl methacrylate) plate (16), two side panels (17), backplate (18) and base plate (19) connect to form the model casing framework, and the surrounding of model casing framework embeds in angle steel (15), soil pressure cell (11) is embedded in soil sample (21), and acceleration transducer (12) is positioned over soil sample (21) top.
2. semi-module test box for dynamic compaction reinforced foundation model test according to claim 1, it is characterized in that montant (13) and cross bar (14) in support (4) are respectively 4, form a framed structure, be placed on model casing (10) top.
3. semi-module test box for dynamic compaction reinforced foundation model test according to claim 1 is characterized in that totally 12, angle steel (15) in model casing (10), lays respectively at model casing frame roof, bottom and centre, is respectively 4.
CN 201010179323 2010-05-20 2010-05-20 Semi-module test box for dynamic compaction reinforced foundation model test Expired - Fee Related CN101832993B (en)

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CN102032896B (en) * 2010-10-19 2012-04-25 电子科技大学 Method for automatically monitoring forced ramming project based on laser ranging and image recognition
CN102493499A (en) * 2011-11-16 2012-06-13 中南大学 Model test device for measuring composite foundation lateral deformation and layered sedimentation
CN102704459B (en) * 2012-03-30 2014-06-04 温州大学 Test device of indoor model for reinforcing soft soil foundation by dynamic compaction
CN103374931B (en) * 2012-04-25 2015-06-03 同济大学 Test device for simulating wind power base affected by three-way coupling loads
CN105986582B (en) * 2015-01-29 2018-11-13 山东大学 Forced ramming reinforcing difference level of ground water ground indoor model device and test method
CN104749054B (en) * 2015-03-13 2017-05-03 同济大学 Three-dimensional controllable dynamic compaction simulated centrifuge testing mechanical arm device
CN105783975A (en) * 2016-03-03 2016-07-20 同济大学 Centrifuge test forced tamping simulation auxiliary test device
CN106836317B (en) * 2017-02-24 2018-07-03 同济大学 A kind of pile sinking model test apparatus for considering soil plug effect and its application
CN108037267B (en) * 2017-12-06 2020-08-11 湖南大学 Test device for simulating water leakage erosion scouring of pipeline to induce road collapse
CN112832226B (en) * 2021-01-11 2022-02-18 长沙理工大学 Method and device for determining evaluation index of effective reinforcement range
CN113431102A (en) * 2021-06-23 2021-09-24 长安大学 In-hole dynamic compaction device in physical model test and construction method thereof

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